Process for the production of hot rolled steel or heavy plates

US4994118A · kind A · utility

Assignee

• Thyssen Stahl AG · DE

Inventors

• Hans Pircher · Oberndorf bei Salzburg, AT
• Rudolf Kawalla · Bottrop, DE
• Jurgen Mahn · Krefeld, DE
• Gerd Sussek · Hanau, DE
• Walter Wilms · Duisburg, DE
• Waldemar Wolpert · Dinslaken, DE

Key dates

• Filing date: Jul 27, 1989
• Grant date: Feb 19, 1991
• Expiry date: Jul 27, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D8/0205
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the production of hot rolled strip or heavy plates from stainless and refractory steels or from forgeable alloys on a nickel basis with a final thickness in the range of 5 to 60 mm by the production of a slab from monobloc casting or by continuous casting and heating the slab at a temperature above 1100.degree. C. followed by the hot rolling of the slab and accelerated cooling of the product rolled to the end thickness. The characterizing feature of the invention is that the heated slab is rolled without interruptions first to a maximum of 1/6 of its initial thickness, mainly by deformation passes in which the degree of deformation pass in the thickness direction is greater than the degrees of deformation shown by curve A in FIG. 1, in dependence on the surface temperature of the product. Then finish rolling is performed to the end thickness, mainly by deformation passes in which the degree of deformation per pass in the thickness direction is greater than the degrees of deformation shown by curve B1 or curve B2 in FIG. 1, in dependence on the surface temperature of the product and the pause between two adjacent passes as parameters. The surfa…